IOP Conf. Series: Materials Science and Engineering最新文献

Study on parameters affecting the mechanical properties of dry fiber bundles during continuous composite manufacturing processes 连续复合材料制造过程中影响干纤维束力学性能的参数研究

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-09-05 DOI: 10.1088/1757-899X/139/1/012034

A. Maier, R. Schledjewski

{"title":"Study on parameters affecting the mechanical properties of dry fiber bundles during continuous composite manufacturing processes","authors":"A. Maier, R. Schledjewski","doi":"10.1088/1757-899X/139/1/012034","DOIUrl":"https://doi.org/10.1088/1757-899X/139/1/012034","url":null,"abstract":"For continuous manufacturing processes mechanical preloading of the fibers occurs during the delivery of the fibers from the spool creel to the actual manufacturing process step. Moreover preloading of the dry roving bundles might be mandatory, e.g. during winding, to be able to produce high quality components. On the one hand too high tensile loads within dry roving bundles might result in a catastrophic failure and on the other hand the part produced under too low pre-tension might have low quality and mechanical properties. In this work, load conditions influencing mechanical properties of dry glass fiber bundles during continuous composite manufacturing processes were analyzed. Load conditions, i.e. fiber delivery speed, necessary pre-tension and other effects of the delivery system during continuous fiber winding, were chosen in process typical ranges. First, the strain rate dependency under static tensile load conditions was investigated. Furthermore different free gauge lengths up to 1.2 m, interactions between fiber points of contact regarding influence of sizing as well as impregnation were tested and the effect of twisting on the mechanical behavior of dry glass fiber bundles during the fiber delivery was studied.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133395811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Local fatigue behavior in tapered areas of large offshore wind turbine blades 大型海上风力发电机叶片锥形区域的局部疲劳行为

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-09-02 DOI: 10.1088/1757-899X/139/1/012022

Seyed Aydin Raeis Hosseiny, J. Jakobsen

引用次数: 3

Mechanisms to create high performance pseudo-ductile composites 创造高性能伪延性复合材料的机制

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-09-02 DOI: 10.1088/1757-899X/139/1/012010

M. Wisnom

引用次数: 17

A molecular dynamics study on the interaction between epoxy and functionalized graphene sheets 环氧树脂与功能化石墨烯相互作用的分子动力学研究

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-09-02 DOI: 10.1088/1757-899X/139/1/012036

L. Melro, R. Pyrz, L. Jensen

引用次数: 10

Development of novel composites through fibre and interface/interphase modification 通过纤维和界面/界面改性开发新型复合材料

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-09-02 DOI: 10.1088/1757-899X/139/1/012001

A. Bismarck, J. Blaker, DB Anthony, H. Qian, HA Maples, P. Robinson, M. Shaffer, E. Greenhalgh

引用次数: 13

Applications for carbon fibre recovered from composites 从复合材料中回收碳纤维的应用

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-09-02 DOI: 10.1088/1757-899X/139/1/012005

S. Pickering, Z. Liu, T. Turner, Kh Wong

{"title":"Applications for carbon fibre recovered from composites","authors":"S. Pickering, Z. Liu, T. Turner, Kh Wong","doi":"10.1088/1757-899X/139/1/012005","DOIUrl":"https://doi.org/10.1088/1757-899X/139/1/012005","url":null,"abstract":"Commercial operations to recover carbon fibre from waste composites are now developing and as more recovered fibre becomes available new applications for recovered fibre are required. Opportunities to use recovered carbon fibre as a structural reinforcement are considered involving the use of wet lay processes to produce nonwoven mats. Mats with random in-plane fibre orientation can readily be produced using existing commercial processes. However, the fibre volume fraction, and hence the mechanical properties that can be achieved, result in composites with limited mechanical properties. Fibre volume fractions of 40% can be achieved with high moulding pressures of over 100 bar, however, moulding at these pressures results in substantial fibre breakage which reduces the mean fibre length and the properties of the composite manufactured. Nonwoven mats made from aligned, short carbon fibres can achieve higher fibre volume fractions with lower fibre breakage even at high moulding pressure. A process for aligning short fibres is described and a composite of over 60% fibre volume fraction has been manufactured at a pressures up to 100 bar with low fibre breakage. Further developments of the alignment process have been undertaken and a composite of 46% fibre volume fraction has been produced moulded at a pressure of 7 bar in an autoclave, exhibiting good mechanical properties that compete with higher grade materials. This demonstrates the potential for high value applications for recovered carbon fibre by fibre alignment.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126534823","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 37

The effect of early berthing prospects on the energy efficiency operational index in oil tanker vessels 早期靠泊前景对油船能效运行指标的影响

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-23 DOI: 10.1088/1757-899X/145/8/082001

N. Acomi, O. Acomi

{"title":"The effect of early berthing prospects on the energy efficiency operational index in oil tanker vessels","authors":"N. Acomi, O. Acomi","doi":"10.1088/1757-899X/145/8/082001","DOIUrl":"https://doi.org/10.1088/1757-899X/145/8/082001","url":null,"abstract":"Marine pollution is one of the main concerns of our society. In order to reduce air pollution produced by ships, the International Maritime Organization has developed technical, operational and management measures. Part of the operational measures refers to CO2 emissions that contribute to the energy efficiency of the vessel. The difficulty in assessing the energy efficiency of the vessel rests with the diversity of voyage parameters, including quantity of cargo, distance and type of fuel in use. Assessing the energy efficiency of the vessel is thus not a matter of determining the absolute value of the CO2, but of providing a meaningful construct to enable tracking performance trends over time, for the same ship, a fleet of ships or across the industry. This concept is the Energy Efficiency Operational Index, EEOI. The purpose of this study is to analyse the influence of a well predicted voyage on the EEOI value. The method used consists in a comparative analysis of two situations regarding berthing prospects: the real passage plan and an early prediction that supposes the vessel to arrive on time as required. The results of the study represent a monitoring tool for the ship owners to assess the EEOI from the early stage of designing the berthing prospects.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131287887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Controlling pool depth during VAR of Alloy 718 718合金VAR时池深控制

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-10 DOI: 10.1088/1757-899X/143/1/012014

F. Lopez, J. Beaman, R. Williamson, D. Evans

引用次数: 1

Auxiliary particle filter-model predictive control of the vacuum arc remelting process 真空电弧重熔过程的辅助粒子滤波模型预测控制

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-10 DOI: 10.1088/1757-899X/143/1/012018

F. Lopez, J. Beaman, R. L. Williamson

引用次数: 1

Experimental und numerical investigations on cooling efficiency of Air-Mist nozzles on steel during continuous casting 连铸过程中空气雾喷嘴冷却效率的实验与数值研究

IOP Conf. Series: Materials Science and Engineering Pub Date : 2016-08-10 DOI: 10.1088/1757-899X/143/1/012033

G. Arth, M. Taferner, C. Bernhard, S. Michelic

{"title":"Experimental und numerical investigations on cooling efficiency of Air-Mist nozzles on steel during continuous casting","authors":"G. Arth, M. Taferner, C. Bernhard, S. Michelic","doi":"10.1088/1757-899X/143/1/012033","DOIUrl":"https://doi.org/10.1088/1757-899X/143/1/012033","url":null,"abstract":"Cooling strategies in continuous casting of steel can vary from rapid cooling to slow cooling, mainly controlled by adjusting the amount of water sprayed onto the surface of the product. Inadequate adjustment however can lead to local surface undercooling or reheating, leading to surface and inner defects. This paper focuses on cooling efficiency of Air-Mist nozzles on casted steel and the experimental and numerical prediction of surface temperature distributions over the product width. The first part explains the determination of heat transfer coefficients (HTC) on laboratory scale, using a so called nozzle measuring stand (NMS). Based on measured water distributions and determined HTC's for air-mist nozzles using the NMS, surface temperatures are calculated by a transient 2D-model on a simple steel plate, explained in the second part of this paper. Simulations are carried out varying water impact density and spray water distribution, consequently influencing the local HTC distribution over the plate width. Furthermore, these results will be interpreted with regard to their consequence for surface and internal quality of the cast product. The results reveal the difficulty of correct adjustment of the amount of sprayed water, concurrent influencing water distribution and thus changing HTC distribution and surface temperature.","PeriodicalId":359151,"journal":{"name":"IOP Conf. Series: Materials Science and Engineering","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-08-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132688188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0